CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2011	$ 274,834	$ 704	$ 750,332	$ 2,492	$ (478,694)
Balance (in shares) at Dec. 31, 2011		70,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with employee stock plans and other (in shares)		(271)
Issuance of common stock in connection with employee stock plans and other	(751)	5	(756)
Employee stock purchase plan (in shares)		305
Employee stock purchase plan	1,027	1	1,026
Share-based compensation expense	8,947		8,947
Net change in other comprehensive income (loss), net of tax	3,810			3,810
Net loss	(10,696)				(10,696)
Ending Balance at Dec. 31, 2012	277,171	710	759,549	6,302	(489,390)
Balance (in shares) at Dec. 31, 2012		71,030
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with employee stock plans and other (in shares)		924
Issuance of common stock in connection with employee stock plans and other	(85)	9	(94)
Employee stock purchase plan (in shares)		351
Employee stock purchase plan	911	4	907
Share-based compensation expense	7,727		7,727
Income tax benefit from share-based compensation	60		60
Net change in other comprehensive income (loss), net of tax	2,090			2,090
Net loss	(16,327)				(16,327)
Ending Balance at Dec. 31, 2013	271,547	723	768,149	8,392	(505,717)
Balance (in shares) at Dec. 31, 2013		72,305
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with employee stock plans and other (in shares)		1,647
Issuance of common stock in connection with employee stock plans and other	(971)	16	(987)
Employee stock purchase plan (in shares)		335
Employee stock purchase plan	2,178	4	2,174
Share-based compensation expense	12,411		12,411
Net change in other comprehensive income (loss), net of tax	(9,004)			(9,004)
Net loss	(3,834)
Ending Balance at Dec. 31, 2014	$ 272,327	$ 743	$ 781,747	$ (612)	$ (509,551)
Balance (in shares) at Dec. 31, 2014		74,287